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# Astronomical question and answer 229

Frank L. Preuss

What are the two things, which one has to consider to better understand the movements of the moon and to predict them?

There is once the first fact that the moon is later every day so about 50 minutes; therefore for example rises later and sets later. See 31. These are more exactly 48.8 minutes per day and that are 48.8 minutes/day divided by 60 minutes = 0.8 hours/day.

And then it is that the moon, caused by the first fact, moves its position every day to its position a day before. And that are 12.2 degrees per day.

The sun turns every hour by 15 degrees. How is it then with the moon? Does the moon turn every hour by 15 degrees?

Today is waning half-moon. With full moon the moon sets in the morning. From full moon to waning half-moon it is about 8 days and as a result that is 0.8 hours/day x 8 days = 6,4 hours and that is half a day. And half a day after morning is midday. And consequently the waning half-moon sets midday.

It is quite hazy today and about one to two hours before midday und because I knew where to expect the moon to be, I could see it, but the colour of the moon and the colour of the sky were almost the same.

This is the end of "Astronomical question and answer 229"
To the German version of this chapter: Astronomische Frage und Antwort 229

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